##// END OF EJS Templates
remove unregister trait-change callback in ExtensionManager.__del__...
remove unregister trait-change callback in ExtensionManager.__del__ Due to reference cycles, this can never be called at a time when it would matter, but seems to cause weird crashes sometimes during interpreter teardown on Python 3.5 with traitlets 4.1.

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Development version

This document describes in-flight development work.

Warning

Please do not edit this file by hand (doing so will likely cause merge conflicts for other Pull Requests). Instead, create a new file in the docs/source/whatsnew/pr folder

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